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BOOK I

PRIMER
OF HYGIENE

BEING A SIMPLE TEXTBOOK ON PERSONAL

HEALTH AND HOW TO KEEP IT

BY

JOHN W. RITCHIE

PROFESSOR OF BIOLOGY, COLLEGE OF WILLIAM AND MARY, VIRGINIA

AND

JOSEPH S. CALDWELL

PROFESSOR OF PLANT PHYSIOLOGY,
ALABAMA POLYTECHNIC INSTITUTE

Illustrated by
KARL HASSMAN

and
HERMANN HEYER

REVISED EDITION

YONKERS-ON-HUDSON, NEW YORK
WORLD BOOK COMPANY

Edur T 399.17.730

CONSERVATION OF HEALTH

“ Our national health is physically our greatest asset.
prevent any possible deterioration of the American stock
should be a national ambition." - THEODORE ROOSEVELT.

To

PRIMER OF HYGIENE

By John W. Ritchie of the College of William and Mary in Virginia
and J. S. Caldwell of the Alabama Polytechnic Institute. Illus-
trated. Cloth. List price 40 cents.
The purpose of this first book is to teach the lower grade pupil what
he himself can do to keep his body in health - personal hygiene.

PRIMER OF SANITATION

By John W. Ritchie. Illustrated. Cloth. List price 50 cents.
The second book in the series and the first in the English language
to teach fifth or sixth grade pupils how to escape germ diseases and
how coöperate in conserving community health - public hygiene,

PRIMER OF PHYSIOLOGY

By John W. Ritchie. Illustrated. Cloth. List price 60 cents. Teaches health conservation through practical applications to daily life of modern hygiene based on physiological principles as required in sixth or seventh grades; the most advanced of the three primers.

HUMAN PHYSIOLOGY

By John W. Ritchie. Illustrated in black and in colors. Cloth.
List price 80 cents.
An advanced book which completes the series and gives the essentials
of physiology, and the knowledge of hygiene, bacteriology, and san-
itation that every American citizen needs.

WORLD BOOK COMPANY

YONKERS-ON-HUDSON, NEW YORK

RCP OF H : RE- 28

Copyright, 1910, 1915, by World Book Company. Entered at Stationers' Hall,

London. All rights reserved.

HARVARD COLLEGE LICRARY

GIFT OF
ALBERT BUSHNELL HAT

DEC 5 1923

In comparatively recent years a new knowledge that is able to save man from a great part of the sickness that has heretofore afflicted him has come into the world. This knowledge reaches the people but slowly, however, and there are yet at all times in the United States three millions of people who are seriously ill, one half of them suffering from ailments that are easily preventable.

The writers of this text have felt that the greatest immediate service our schools can render is to teach the facts that will enable the people to shake off the great burden of preventable disease that they are now carrying. They believe that hygiene should be faithfully taught in every schoolroom in the land, and that the object of teaching it should be the prevention of sickness. He who would seek the motive of this small volume will therefore easily find it; for the single purpose of the authors has been to select the facts that have been shown by modern science to be vital in health conservation, and to present these facts in the simplest form possible.

It is believed that those familiar with our crowded school curricula will appreciate the slim compass into which the matter has been brought, and it is hoped that this little book may serve a useful purpose in the hands of those earnest teachers who are leading their pupils and their communities into the Era of Health that lies before us.

It is impossible to name all who have read the proofs of this book and assisted the authors by valuable suggestions and criticisms, but among those to whom grateful acknowledgment is made

are the following: Leonard P. Ayres, Dr. L. B. Bibb, Dr. H. M. Bracken, Dr. William H. Burnham, Dr. C. Ward Crampton, Dr. S. J. Crumbine, Dr. Martin H. Fischer, Dr. Christian A. Herter, Prof. C. W. Hetherington, Dr. Samuel A. Hopkins, Dr. J. N. Hurty, Dr. F. V. Jackson, Dr. James M. King, Dr. George D. Leslie, Dr. R. Tait McKenzie, Dr. H. W. Morgan, Dr. S. W. Newmayer, Dr. J. E. Raycroft, Dr. G. F. Rheinhardt, Dr. Stewart R. Roberts, Dr. William F. Snow, Dr. A. R. Ward, Dr. Herbert L. Wheeler, Dr. C. E. A. Winslow.

The Oral Hygiene Committee of the National Dental Association, through Dr. W. G. Ebersole, Dr. W. A. White, and Dr. Paul G. White, chairman of the textbook committee, has given help for which grateful acknowledgment is made; and for giving the book the invaluable test of actual use in the schoolroom the authors are indebted to Miss Florence Gray, Yonkers, New York; Miss Mary Pierce and Miss Frances Dunn, Farmville, Virginia; Miss Virginia Jones, Williamsburg, Virginia; and Miss Jessie B. Montgomery, Terre Haute, Indiana.

Other practical and experienced teachers who read the proof and gave helpful suggestions were Miss Josephine K. Bauer, Indianapolis, Indiana; Frank Evans, Spartanburg, South Carolina; Miss Minnie Fisher, Montgomery, Alabama; Miss Mary P. Jones, Nashville, Tennessee; Mrs. John L. Price, Florence, Alabama; and Miss Flora Wilber, Fort Wayne, Indiana.

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